Philips CD304 MK2 help please

[tubee]

Btw yesterday compared CD sound from a plastic DVD player with dig-out to Marantz SR4300 working as dac and pre to my poweramps. The modded 304 mk2 outperformed it. The CDM1 is not fast, but it took a lot longer time before CD was readed in the DVD.

[beamnet]

I know that. But i have no schems for the player. As Ultranalog is living in england now and doesn't reply to mail anymore, i can't buy his cd.

Interestingly however, i could make a NONOS/OS switchable DAC.
I think that is should go for OS. I have a very large bandwidth Tube Amp (f2 of 22khz is only 2db down) and don't want the risk of blowing tweeters...

Bas

[tubee]

Bas, SAA7220 is not the best OS filter imo, but when you build a special shunt PS for it and good (sanyo oscon or whatever) decoupling with beads go for it.
Rudo has build nice shunts: http://home.hccnet.nl/r.r.meijer/cdd.html

I don't understand your comment about the tweeter, what has this to do with os/nonos?

[Zen Mod]

Originally posted by beamnet
I know that. But i have no schems for the player. As Ultranalog is living in england now and doesn't reply to mail anymore, i can't buy his cd.
.............

Bas

try this link

http://user.planetaclix.pt

[beamnet]

I have the 304 manual, but the digital (dac) board is different in the mk2

But i think it might ust be enough to get something working..


Bas

[Onnosr]

Hi

1 I do have the service manual of the CD304 mkII in pdf
It is 9.8 mb (pse suggest how to get that file to you)

2 I managed to get a cd304 mk II decoder board into
an CD 104. works like a charm.

3 Because I like two 1541a parallel I simply soldered on top
of the existing 1541a a second one.
all pins are connected parallel except pin 16 and 17 (clock)
removed the original 390 pf smd from the board, replaced it
by a 470 pf and I put on the not connected pins (16,17)
from the second dac also a 470 pf
for sync the clocks I put a 100 pf between pins 16 from each
1541a
(BTW the decoupler caps on the board (smd) are 0,2 (not 0,1)
mf) I did not change those caps.
There is a heathsink to cool the 1541a's
IHMO there is now more dynamics in the sound

4 Now I am busy to make it nonos using the existing clock of
the saa 7220. only to hear the difference.

5 AND A VERY GOOD 2007 !


Onno

[poynton]

Originally posted by Onnosr
Because I like two 1541a parallel I simply soldered on top
of the existing 1541a an second one

Same caps or separate caps??

Andy

[Onnosr]

Originally posted by poynton




Same caps or separate caps??

Andy

Hi Andy

same caps (I edit my post after your post)

Onno

[a333bt]

Originally posted by Onnosr


Hi Andy

same caps (I edit my post after your post)

Onno

Hi Onno,

i changed smd caps around TDA1541 to 100nF BC foil capacitors and make big difference in sound, much better.

regards, Bostjan

[Onnosr]

Originally posted by a333bt



Hi Onno,

i changed smd caps around TDA1541 to 100nF BC foil capacitors and make big difference in sound, much better.

regards, Bostjan

Hi Bostjan

I did same in a cd104 but I noticed heavy rfi emc problems
(100 meters away is a gsm tower !)
The big leads and the big capacitor itself are antenna's !
those smd's are the smallest (antenna) you can get.

The only thing I did was renewing the soldering of those smd caps ( and wait < 24 hours so settle). After that the sound was IHMO better.

I have seen your email about the manual.
I tried to send the file but nope obvious to big.
The manual itself is strange
the decoder board and power suplpy (schematic and PCB) are CD304 MKII and the rest CD 304
I will send you the relevant pages (less space)

Best regards,

Onno